GB1473647A - Transducing devices - Google Patents

Transducing devices

Info

Publication number
GB1473647A
GB1473647A GB3268473A GB3268473A GB1473647A GB 1473647 A GB1473647 A GB 1473647A GB 3268473 A GB3268473 A GB 3268473A GB 3268473 A GB3268473 A GB 3268473A GB 1473647 A GB1473647 A GB 1473647A
Authority
GB
United Kingdom
Prior art keywords
mesh
july
acoustic
selected area
output transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3268473A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Original Assignee
EMI Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EMI Ltd filed Critical EMI Ltd
Priority to GB3268473A priority Critical patent/GB1473647A/en
Publication of GB1473647A publication Critical patent/GB1473647A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/0296—Surface acoustic wave [SAW] devices having both acoustic and non-acoustic properties

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1473647 Surface wave devices EMI Ltd 9 July 1974 [9 July 1973] 32684/73 Heading H3U An electro-acoustic transducing device comprises a piezoelectric body 3 positioned adjacent to and spaced from a conductive mesh 4 to which is applied an input signal, an electron beam 1 being directed at a selected area of the body 3 so as to generate surface waves in accordance with the signal applied to the mesh. The surface waves are detected by an output transducer B. The width of the selected area in the direction of wave propagation is of the order of #/4 (# being the acoustic wavelength). A plurality of electron beams may be provided with their respective areas separated by a distance which is variable to alter the frequency response of the device. The beams may be produced from a single wide beam by a mask, which may additionally serve as the mesh 4. A variable delay line may be provided by arranging for the beam 1 to be movable along the body 3 with respect to output transducer B. This arrangement may also be used to obtain pulse stretching, pulse compression and "time inversion" in which the beam moves along body 3 faster than the surface acoustic wave. If the beam deflection is a parabolic function of time a constant frequency burst may be converted into a chirp pulse.
GB3268473A 1974-07-09 1974-07-09 Transducing devices Expired GB1473647A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3268473A GB1473647A (en) 1974-07-09 1974-07-09 Transducing devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3268473A GB1473647A (en) 1974-07-09 1974-07-09 Transducing devices

Publications (1)

Publication Number Publication Date
GB1473647A true GB1473647A (en) 1977-05-18

Family

ID=10342459

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3268473A Expired GB1473647A (en) 1974-07-09 1974-07-09 Transducing devices

Country Status (1)

Country Link
GB (1) GB1473647A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100377371C (en) * 2003-12-05 2008-03-26 鸿富锦精密工业（深圳）有限公司 Light-emitting diode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100377371C (en) * 2003-12-05 2008-03-26 鸿富锦精密工业（深圳）有限公司 Light-emitting diode

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee